Automatic bleeder valve for auxiliary reservoirs of air-brake systems



May 13,1930. J. M. .AIKMAN I 1,758,136

AUTOMATIC BLEEDER VALVE FOR AUXILIARY RESERYOI RS OF AIR BRAKE SYSTEMS Filed June 21, 1928 FZyZ F 5 22 g 1 1a 11 12 v 1 h 13 IT V I1! -ll| i: T Z IJII j w]! 4- 2 23 V IKE V TOE Patented 'May 13, 1 930 mT STA Josnrn 111. AIKMAN, or

STILLWATER, umnnsorn- AUTOMATIC BLEEDER vALvE roninnxrnmnr nesenvom or ra-BRAKE SYSTEMS, o

Application filed'June 21, 1928. 7 Serial in. 287,101.,{ 3

Another feature is the provision means of preventing the emptying of, the reservoir 7 by accidental or intentional pulling of'fthe lever when the pressure in the reservoir is above that resulting, from a full application ofthe brakes. P 1 j I attain these objects by the mechanism illustrated in the accompanying drawing in which:' V e Figurel is Figure 2 is Figure?) valve; Figure 4 is a detail of the pilot valve; Figure 5 is' a detail ofthe main valve; and Figure 6 is a section showing the" auxiliary valve. :3

"Referring to the drawing,uthe valve consists of anupper body 1, a lower body 2, an inlet port 3, outlet ports4, main valve 5, vertical passage 6 invalve 5,inlet ports-7 con necting with passagefi, pilot valve- 8, seat and guide 91for pilot'valve, pilot valve spring 10, main valve spring 11, recess 12 in pilot valve, ports 13 at upper end of main valve, lower guide 14 for-main valve, diaphragm 15,

threaded connection16 to screw into reservoir, fulcrum pins'17, operating lever 18,air

inlet 19 to space below diaphragm, pressure a plate 20-for diaphragm, clamp nut 21, outlet port 22 for pilot valve, seat 23 for main valve, chamber 24 above diaphragm, auxiliar valve 25, inlet 26 to auxiliary valve, outlet 27 from auxiliary. valve, spring28, and cap 29. V

-The operation of the valveis asfollows: Air pressure from'the reservoir enters thru the inlet 3 and passes thru port 19to theunder side of the diaphragm 15, thru ports7, 6, and 13 to the chamber 24' above diaphragm 15, thus equalizing the pressure above and belowthe diaphragm 15. Spring 11 is of the required strength to exert a pressure equal to 2% lbs. per square inch and this pressure a view of the top 1 1-116 valve; a cross'seotion thruithe valve;

is a side view of the exterior of the r ous pull on'lever 18 to combined with the air pressure above the valve seat 23 holds the valve 5 closed.

Spring'10 holds the pilot-valve 8 closed, thus preventing the escape of air from the cham-,

ber'24; er ends andwhich extend to thesides of the car. when it is desired to relievethe pres}; sureffromthe reservoir a'fterjspotting a car, .a pull --on either rod pushes the pilot "valve 8 downward. In moving downward the low er end of the pilot valve covers the portal?) at the upper'endof the main valve 5, thus pre- Lever 18 has rods attached to its lowventing airffrom below diaphragm 15 reaoh-' ing the chamber '24 above it; The pilot-valve 8 also moves away from its seat 9 and allows the air in chamber 24 tofpass out thru port 1 22. When' th'e pressure in chamber 2,4 l1as dropped 2 lbs,- the pressure below the dia phragmi 15 pushes"; it upward thus raising valve 5 from its seat 23. The raising of-valve 5 causes1the ports 7 I to be covered by guide 14, thus cutting off the passageof air thru port 6.- This seals the'ports at top and bottom of valve 5. The'air in the reservoirpasses out thru the passage 3 and ports 4- to the at mosphere. Y

-' When thexreservoir pressure drops to 5 lbs. the spring'llbeginsto push/the valve 7 Q5 downward, thus uncoveringportsi and 13 and allowing air to "enter the chamber 24 which equalizes the pressure above and below the diahpragm 15: I The pilot valve 8 returns to its seat as'soon as the rod isreleased and is in a position so that ports? and 13willbe uncovered at the same time, as valve 5.;descends. The spring 11, forces valve 5 against its. seat 23' thus restoring 'the valve to its original position. f 1 a f I I By following the above operation, it will be seenthat it is unnecessary to exert a continuempty the reservoir,

as one quick pull is sufficient to release the air from the chamber. 24 and open the valve. It will also'bev seen that thevalve will remain open as long as the pressure in the reservoir is above'5 lbs. and it is evident that should the valve be tripped while there is'fullpressure on; the train pipe, -it :would' stayopen and form-acontinuous .air. leak;

V tTopreventrtheabove undesirable res lt;

have provided the auxiliary valve zo. The

spring 28 is adjusted so as to-hold valve 25 closedup to 50 lbs. which is the pressure in the reservoir after a full application of the Brakes. Should the valve be tripped with the brakesreleased and with full pressure in the train pipe-and auxiliaryreservoirs, the

ary val-sve'ifisfunictions as tgllogvs A drop in pressure'in chamber allows Salve 25 to rise from its seat, thus p erm itting air from the reservir to pass fihru port 2 l9 md valve 2 an t rupo .2 in the chamber '24 and'equalize' the 'pressureabove and below diaphragm lb. The valve 5 ,is

hereby prevented fr'omi i'si'ngffrom its seat;

a V dhsflae spring lil gexerts a pressure of lbs. downward, 1, a difielzenbial 2 f 521/2 Q an take: place above andsbelowe theidiaplgragm beffene main aalvefiabeginsatosnise. l his ili fi flmfitaiahflf' Jbsbeing ampleto cause a flow 10d? air. zthnu the :auxiliagigy val ve "25, thus quickly. equalizing the;

below; thediaphragm 15 331ml 'preventiag the {pnesSune above and valves Ai i fiaP fi w u & ae-ielosed Flay a doiv awandmovement olthe thru ports 6cand=7 gtheauxilianywalveg;pro

viales-a typass yfar this eme geasv v v JHavimg described invention; \what ;I

elaimais M.- r

it. In a-zbleederavalva theieombination with aabiody, 1a; avalveaseait therein, inlet iai jd outlet poi-ts rfrom uSgllQl wseat a m-ain i'walveanesting on :said seat? andnarranged 41o: gpen and-gelose said portsazaaguifc le drawer end ots-aid valve, a diaphragm and; pressuregplate attaclredfto said ivalvaepassages:iasqid valve,

at ch dtheret ,el alli fi abov 'fiml el w said di Hhm-gmfi wage-em aiuna nwaw sa d m iamhe s, {a pilot valv to openimldeloseia-;per treonuecztipgsaid sham hereaboyeisiiid diaphragm with gtlaeaatmos- *pherepayguide. at ithevloawemend oifazsaid pilot valve for said mainwalve zmdmmangedzto epen a'nd close parts at fl pper send :ofrsaid attachedtp said valve, aapi main valve, and springs holding said pilot valve and main valve closed. I

3. Ina bleeder valve, thecombination with a body, a mainvalve therein, inlet and outlet v ports for said valve, a diaphragm attached to said valve, chambers above and below said diaphuagm, ,a'pilot valve for-relieving the pnessureyin- 'said chamber :above said diahra gm, said chamber below said diaphragm eing continuously in communication With the auxiliary reservoir 'thru said inlet port, a .ra ag in s d body f rm ng vby as around said diaphragm, a "valve and seat in said passage, and, a spring holding'said" valve 'lose'd;

epeai-ing a v po nt ,to allovv the escape of air" 1 mm rcf aex iarve se aeirw d aph gm" e s he Pre r la vesai i hea ma d ot valve to rel f 85.

a lewlsai aphragr fm i s a d valve from its seat, andan au xiliarylvalve araaas -(wimeve t the P u e a ov sii v laphsee b ie eli via .s tiici e tlifi eal w said' m in l 't epenfksf Ifidkbmke 1; application has-ib enwmade.

-.e --Ai b1eele wa ve eQ-Inm a s a m in. valve, a pilot valve, and' 'an auiiiliary valv a d m s 'h sM a Q sQa QY- win s a le ver to openrsaid pilot valva a rfilead' from said auxiliary valve to said pilot w eaa aag it maa d ri e va v to ,th attaespheme, said mf m aid puot valve beingtsmallera han sa iauvvalve a I L 1 s i F6, h aab e ie wi miheeemb na i n w bedy, ma val aai i e i i s 3 l X iary valve, springs for said valves, portspon- .p.ea z m ai i-au neetl sg a Wa v syaf w ap rating Pilet {va ve sa d p ing sad s i so it cm ases aaxa ont au us y, ir ua x i ry ee W -Wi hin aia e from?! -l vd w flfh ps ssiwe r a ibe wmlbs a mem nt ay puller-on sa d-le er ma we; s i

said; Esaue .1 r a l ii iar se ve r s as m 'filb 7. .A ,bleede ive; comprisir gv (body, va

main a liii l -v l aa taux a yi alve,

sprangsiorlsaidvalves, a diaphragm for said mainvalv PQ s l u a IibQslVQo nectings v W .0 QR l vandremain open unt l I valv s, a1ev r1 1ierat 'es, field pilqt a e a I arrai gs tevp nandd se i ma a iliary reservoir thrillsaid' valve to atmosphere,

Withina range' from mllbs. 'to=5O -1bs;ihy pgu: ing arfd releasing said lever, and-"ate aritomaticall-yopen said main valve andiform a V continuousa outlet for;air ifrromrauxiliaryi res ervoirdown! to 51 lbsi'sbyiaisinglei PUll'QIluSfiJld lever "when iaauzzkizliaa-y harem-air pressure V r #105 a er art eaa l hati vli ldia P4 91 a a uwpe i 

